Pretty much any charger with a mini usb interface will work, so anything for a blackberry or other device with that connection. As i said in the other post the usb interface is defined as 5 volts, and T400 comes with a straight through cable so you know it doesn't need anything special. Check out the power section of the USB spec on wikipedia for more info. You could probably pick up one for $10 at target or best buy in the phone section. Or you can get a AC to female USB adapter and then plug in the cord that came with your player.